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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198ea7e2b32a9f758675e77b99f3cb43f72e598c71d6a27d46e071857eeb1c2e' 
  AND token = 'UpCPfKGAKi630z6yfiDlXKOdmU9z2JBRWRJgmoNWkBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}